http://www.fon.hum.uva.nl/praat/
http://joeystanley.com/blog/a-tutorial-on-extracting-formants-in-praat.html
http://wstyler.ucsd.edu/praat/UsingPraatforLinguisticResearchLatest.pdf
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Statsitics, Research Methods, SAS, R, HLM, Rasch model